Why Doflamingo can't be done in chapter 790:
- his flashback was short, we only got to see his time with Law and not much of him on his own.
- We still don't know what treasure he's talking about
- He said he will become immortal, Oda can't leave that chekovs gun alone
- There's still an admiral in the island
- Half the crew was off screen for the arc, we need to give them moments in Dressrosa
- Doflamingo was already knocked back and got back up
- Croc beat Luffy twice, Oda can't have the best Warlord do worse than that
Honestly guys I think we'll be in Dressrosa for 100 more chapters